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Study On Fabrication And Properties Of Micro-nano Functional Materials

Posted on:2018-08-08Degree:MasterType:Thesis
Country:ChinaCandidate:N N BaiFull Text:PDF
GTID:2321330536973099Subject:Inorganic Chemistry
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In recent years,owing to the unique chemical(catalysis,adsorption,anti-wetting),physical(mechanical and electrical,magnetic,optical,acoustic,thermal)and biological function,the micro-nano sized functional material has become important basic materials in the fields of information technology,energy technology,and biotechnology and other high-tech fields and national defense construction.At the same time,it also plays an important role in the transformation of traditional industries such as chemical industry,building materials and so on.Therefore,the development and research of micro-nano functional materials have a significant role in promoting the progress of national science and technology.At present,the preparation methods of micro and nano functional materials are rich and varied,and different preparation methods are adopted based on different application functions.According to the chemical function and application of micro-nano functional materials,simple,rapid and low cost methods have been developed as well as basing on the current situation of the complex and high cost of functional materials.Then micro-nano functional materials with excellent chemical properties were prepared and applied to the field of anti-fouling,self-cleaning and electrocatalytic hydrogen evolution.The micro-nano structures and their properties were characterized in detail.Specific research contents are as follows:(1)Study on preparation and properties of self-repairing superhydrophobic coatings based on micro-nano structure recovery.Self-healing superhydrophobic coatings(SHCs)have drawn much attention in recent years because of their unique self-healing properties and potential industrial applications.Self-healing SHCs based on recovery of structural damage have been successfully fabricated by spraying the mixture of polymethylmethacrylate /zinc stearate /stearic acid.The SHCs display a static contact angle(CA)of 158 o,a sliding angle(SA)of 1o and exhibit a rough structure as shown in the SEM images.By acid rain scouring,the coatings maintain CA of 134 o and high adhesion due to the broken morphology.Interestingly,the coatings restored superhydrophobicity after immersion in water for several minutes.Furthermore,the SHCs exhibit good long-term stability,water-durability and UV-durability,adapting to out-door environment.Above all,the coatings are environmental,low cost and can be quickly coated on various large-scale substrates,which will widen their practical applications.(2)Study on preparation and performance of high efficient and stable hydrogen evolution catalytic electrode Co/Co P-NF.The development of high efficiency catalysts for hydrogen evolution via water splitting has been an effective strategy to solve the energy environmental problems and energy crisis.The abundant-reserving transition-metals and their phosphides are becoming attractive Pt alternatives for hydrogen evolution reaction(HER).Herein,a crystalline/amorphous Co/Co P film was facilely prepared on nickel foam(NF)by one-step electrodeposition technique at room temperature,named as Co/Co P-NF.The as-prepared Co/Co P-NF exhibits excellent electrocatalytic activity for HER,on par with Pt/C,showing a low overpotential of-35 m V at a current density of 10 m A·cm-2 and small Tafel slope of 71 m V·dec-1.More importantly,the stability tests improve that Co/Co P-NF electrode has good catalytic stability.Moreover,the influence of the electrodeposition parameters on the catalytic performance of the catalyst was discussed.This study offers an effective strategy to develop a non-noble metal HER catalyst for industrial production of hydrogen.(3)Study on preparation and performance of high efficient and stable three-element Ni-Co-S hydrogen evolution catalytic electrode.Due to the well coordinated between the elements,the three-element hydrogen evolution catalytic electrodes possess more efficient catalytic activity for hydrogen evolution than that of the two-element electrodes.Based on accurate adjustment of electrochemical deposition parameters to control the catalytic performance of hydrogen evolution,the three-element of Ni-Co-S electrode was prepared on the surface of nickel foam by a simple and rapid electrodeposition method.Electrochemical tests show that the Ni-Co-S electrode catalyzed hydrogen evolution electrode showed better catalytic properties than that of two-element catalysts.At a current density of 10 m A·cm-2,the Ni-Co-S electrode exhibit a low overpotential of-29 m V,and its Tafel slope is 83 m V·dec-1.The current density of the electrode was hardly changed after 24 h of electrolysis,which indicated that the Ni-Co-S electrode had good catalytic stability.The three-element hydrogen evolution electrode developed in this chapter is to create positive conditions for effective development of future hydrogen economy.
Keywords/Search Tags:Micro-nano, functional material, self-healing superhydrophobicity, hydrogen evolution reaction, electrocatalysis
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